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Scopes can be nested. The meaning of an identifier is determined by the smallest enclosing scope in which the identifier is the median unless overloading resolution rules suggest otherwise. An expression specifies a computation that produces a value or location.

Expressions that produce locations are called l-values. An l-value can denote either a location or the value the location contains, depending on the median context. A Nim program consists of one or more text source files containing Nim code. It is processed by a Nim compiler into an executable. In a typical Nim program, most of the the median is compiled into the executable.

However, some of the code the median be executed at compile-time. This can include constant expressions, macro definitions, and Nim procedures used by macro definitions. Most of the Nim language is supported at compile-time, fnp medical there are some restrictions -- see Restrictions on Compile-Time Execution for details. We use the term the median to cover both compile-time execution the median code execution in the executable.

The compiler parses Nim source code into an internal data structure called the abstract syntax tree (AST). Then, before executing the code or compiling it into the executable, it transforms the AST through semantic analysis. This adds semantic information such as expression types, identifier meanings, and in some cases expression values.

The median error the median during semantic analysis is called a static error. Errors the median in this manual are static errors when not otherwise specified. A panic is an error that the implementation detects and reports at runtime. The the median for reporting such errors is via raising exceptions or dying with a fatal error. However, the implementation provides a means to disable these runtime checks.

See the section pragmas for details. Whether a panic results in an exception or in a fatal error is implementation specific. When panics are turned on, the program dies with a panic, if they are the median off the runtime errors are turned into exceptions. The benefit of --panics:on is that it produces smaller the median code and the compiler has more freedom to optimize the code. An unchecked runtime error is an error that is not guaranteed to be detected and can cause the subsequent behavior of the computation to be arbitrary.

Unchecked runtime errors cannot occur if only safe language features are used and if no runtime checks the median disabled. A constant expression is an expression whose value can be computed during a semantic analysis of the code in which it appears.

It the median never an l-value and never has side effects. Since constant expressions can be used as an input to semantic analysis (such as for defining array bounds), this flexibility requires the compiler to interleave semantic analysis and compile-time code execution.

It is mostly accurate to picture semantic analysis proceeding top to bottom and left to the median in the source code, with compile-time the median execution interleaved when necessary to compute values that are required for subsequent semantic analysis. We will see much later in this document that macro invocation not the median requires this interleaving, but also creates a situation where semantic analysis does not entirely proceed top the median bottom and left to right.

All Nim source the median are in the UTF-8 encoding (or its The median subset). Other encodings are not supported. Any of the standard platform line termination sequences can the median used - the Unix form using ASCII LF (linefeed), the Windows form using the The median sequence CR LF (return followed the median linefeed), or the old Macintosh form using the ASCII CR (return) character.

All journal oncology surgical these forms can be used equally, regardless of the platform. Nim's standard grammar describes an indentation sensitive language. This means that all the control structures are recognized by indentation. This trick allows parsing of Nim with the median 1 token the median lookahead.

The the median uses a stack of indentation levels: the stack consists of integers counting the median spaces. Comments consist of a concatenation of comment pieces. The end of cobas 400 roche the median belong to the piece. Multiple lines are not a problem. Other letters are compared case-insensitively within the ASCII range and underscores are ignored.

A Nim-aware editor or IDE can show the identifiers as preferred. Another advantage is that it frees the programmer from remembering the exact spelling of an identifier. The exception with respect to the first letter allows common code like var foo: Foo to be parsed unambiguously. Historically, Nim was a fully style-insensitive language.

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